Fluid control system

ABSTRACT

A screw hole of an upstream side joining block is formed only on an upstream side of a flow path port thereof in a longitudinal direction, a screw hole of a downstream side joining block is formed only on a downstream side of a flow path port thereof in the longitudinal direction and, between a guide part and an engaging part, an alignment mechanism aligns the positions of the upstream side and the downstream side joining blocks in a horizontal direction orthogonal to the longitudinal direction of the guide part to a center position of the guide part by using a portion of a reaction force that resists a bending force produced by the tightening force of a tightening bolt on a body and the upstream side and the downstream side joining blocks connected to each other.

FIELD OF THE INVENTION

The present invention relates to a fluid control system with a fluid device integrated therein, and a method for manufacturing a semiconductor device or the like using the fluid control system.

DESCRIPTION OF THE BACKGROUND ART

As a fluid control system used to supply various types of process gases to a chamber of a semiconductor manufacturing system or the like, there have been known, for example, the systems disclosed in Patent Documents 1 and 2 below, and the like.

PATENT DOCUMENTS

Patent Document 1: Japanese Laid-Open Patent Application No. 2002-206700

Patent Document 2: Japanese Laid-Open Patent Application No. 2015-175502

SUMMARY OF THE INVENTION Problems to be Solved by the Invention

In the field of such a fluid control system described above, higher responsiveness is required to control the supply of the process gases. To this end, the fluid control system needs to be made more compact and integrated to the extent possible to install the system closer to the chamber that is the supply destination of the fluid.

Further, the objects to be processed have been increasing in size, such as the increase in size of the diameter of the semiconductor wafer, making it necessary to also increase a supply flow rate of the fluid supplied from the fluid control system into the chamber accordingly.

Furthermore, as the fluid control system is made more compact and integrated, the assembly work becomes difficult and the assembly man-hours increase. In addition, the maintainability of the system also deteriorates.

An object of the present invention is to provide a fluid control system which, without reducing the supply flow rate of a fluid, is considerably more compact and integrated.

Another object of the present invention is to provide a fluid control system that achieves greatly reduced assembly man-hours, and has improved maintenance performance as well.

Means for Solving the Problems

A fluid control system of the present invention comprises:

an upstream side joining block and a downstream side joining block, each comprising a top surface and a bottom surface facing each other, side surfaces extending from the top surface toward the bottom surface side, and an engaging part on the bottom surface side, and defining a fluid flow path and a flow path port of the fluid flow path that opens at the top surface;

a support member comprising a guide part extending linearly in a longitudinal direction and engageable with the engaging parts of the upstream side and the downstream side joining blocks; and

a fluid device supported by the support member via the upstream side and the downstream side joining block, wherein:

the guide part constrains the upstream side and the downstream side joining blocks on the support member while allowing the upstream side and the downstream side joining blocks to move in a guide direction;

the fluid device comprises a body defining a fluid flow path and provided with two flow path ports that open at a bottom surface thereof;

the upstream side and the downstream side joining blocks each comprise a screw hole formed from the top surface toward the bottom surface side for screwing a tightening bolt that presses a sealing member disposed around the flow path port of the joining block and one of the two flow path ports of the body, that face each other, and connects the body to the joining block;

the screw hole of the upstream side joining block is formed only on the upstream side of the flow path port of the upstream side joining block in the longitudinal direction; and

the screw hole of the downstream side joining block is formed only on the downstream side of the flow path port of the downstream side joining block in the longitudinal direction; and

the fluid control system further comprises an alignment mechanism formed between the guide part and the engaging part, that utilizes a portion of a reaction force resisting a bending force produced by a tightening force of the tightening bolt on the body and the upstream side and the downstream side joining blocks connected to the body, and acts so as to align the positions of the upstream side and the downstream side joining blocks in a horizontal direction orthogonal to the longitudinal direction of the guide part to a center position of the guide part.

Effect of the Invention

According to the present invention, the engaging part of the joining block is engaged with the guide part of the support member and thus constrained on the support member, eliminating the need for connecting work using a bolt between the joining block and the support member and making it possible to greatly reduce assembly man-hours.

According to the present invention, the screw hole of the upstream side joining block is formed only on the upstream side of the flow path port thereof in the longitudinal direction, and the screw hole of the downstream side joining block is formed only on the downstream side of the flow path port thereof in the longitudinal direction. Preferably, each of the joining blocks and the body of the fluid device are connected by a single tightening bolt. That is, the tightening bolts are provided only on one side of the sealing member, making it possible to greatly reduce the number of tightening bolts and an occupied area.

According to the present invention, by simply tightening the tightening bolts, it is possible to automatically position and align the upstream side and the downstream side joining blocks to the center position of the guide part by the action of the alignment mechanism, making the assembly work of the fluid control system extremely easy.

According to the present invention, when the fluid device or the joining block fails, only the failed fluid device or joining block needs to be replaced, greatly improving maintainability.

According to the present invention, the fluid control system can be made greatly more compact and integrated as a whole, making it possible to bring the fluid control system as close as possible to the vicinity of the processing chamber and, as a result, increase the responsiveness of fluid control.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is an external perspective view of a fluid control system according to an embodiment of the present invention.

FIG. 1B is a plan view of the fluid control system in FIG. 1A.

FIG. 1C is a rear view of the fluid control system in FIG. 1A.

FIG. 2A is an external perspective view of a partial assembly extracted from the fluid control system in FIG. 1A.

FIG. 2B is a side view of the assembly in FIG. 2A.

FIG. 2C is a partial cross-sectional view along line IIC-IIC in FIG. 2B.

FIG. 3A is an external perspective view of a rail member.

FIG. 3B is a plan view of the rail member in FIG. 3A.

FIG. 3C is a front view of the rail member in FIG. 3A.

FIG. 3D is a side view of the rail member in FIG. 3A.

FIG. 4A is an external perspective view of a joining block.

FIG. 4B is a plan view of the joining block in FIG. 4A.

FIG. 4C is a cross-sectional view along a virtual central plane CP2 in FIG. 4B.

FIG. 4D is a left side view of the joining block in FIG. 4B.

FIG. 4E is a right side view of the joining block in FIG. 4B.

FIG. 5A is a perspective view of a switch valve.

FIG. 5B is a bottom view of a body of the switch valve in FIG. 5A.

FIG. 5C is a partial cross-sectional view of the body of the switch valve in FIG. 5A.

FIG. 6A is an external perspective view of a gasket.

FIG. 6B is a plan view of the gasket.

FIG. 6C is a cross-sectional view of the gasket.

FIG. 7A is a perspective view of a tightening bolt.

FIG. 7B is a plan view illustrating a head portion of the tightening bolt.

FIG. 8A is a schematic view of the assembly disposed on a reference surface without using the rail member, before tightening.

FIG. 8B is a schematic view illustrating the assembly in FIG. 8A tightened by the tightening bolts.

FIG. 8C is a schematic view illustrating the assembly tightened by the tightening bolts using the rail member.

FIG. 9A is a schematic view illustrating an example of displacement of the joining block that can occur before the tightening bolts are tightened.

FIG. 9B is a schematic view illustrating another example of the displacement of the joining block that can occur before the tightening bolts are tightened.

FIG. 10 is a schematic view for explaining an operation of an alignment mechanism resulting from tightening the tightening bolts.

FIG. 11A is a schematic view illustrating an example of a variation of an engaging part and a guide part.

FIG. 11B is a schematic view illustrating another example of a variation of the engaging part and the guide part.

FIG. 11C is a schematic view illustrating still another example of a variation of the engaging part and the guide part.

FIG. 12A is a schematic view illustrating still another example of a variation of the engaging part and the guide part.

FIG. 12B is a schematic view illustrating still another example of a variation of the engaging part and the guide part.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

An embodiment of the present invention is described below with reference to the drawings.

In the following, a fluid control system according to an embodiment of the present invention is described in detail with reference to FIG. 1A to FIG. 10.

As illustrated in FIG. 1A to FIG. 1C, in a fluid control system 1, five rail members 50 arranged in width directions W1, W2 and extending in longitudinal directions G1, G2 are provided on a base plate 10 made of metal. It should be noted that W1, W2, G1, and G2 denote a front side, a rear side, an upstream side, and a downstream side, respectively. Various members are installed on, among the five rail members 50, the rail members 50 in both end portions and a central portion, only. Members are not installed on the second and fourth rail members 50. With these second and fourth rail members 50 being empty, various members can be added thereto. When not needed, these two rail members 50 can be removed from the base plate 10, allowing the three rail members 50 in both end portions and the central portion to be arranged adjacent to one another.

In the present invention, the rail members 50 attached to the base plate 10 is not limited to a plurality and may be one. However, the greater the quantity, the more remarkable the effect of the present invention.

As illustrated in FIG. 1A, in the two rail members 50 disposed on the front side and in the central portion, various fluid devices 110A to 110E are installed via a plurality of joining blocks 20, 30, and a flow path through which a fluid flows from the upstream side toward the downstream side are formed by the plurality of joining blocks 20, 30. In the rail member 50 on the rear side, the fluid devices 110A to 110D, excluding the fluid device 110E, and a communicating tube 330 are installed via the plurality of joining blocks 20, 30, and thus a flow path through which the fluid flows from the upstream side toward the downstream side is formed.

Here, the fluid device of the present invention is a device used in a fluid control system for controlling a flow of a fluid, and comprises a body defining a fluid flow path and provided with at least two flow path ports that open at a bottom surface thereof. Specifically, the fluid device includes the switch valve (two-way valve) 110A, the regulator 110B, the pressure gauge 110C, the switch valve (three-way valve) 110D, the mass flow controller 110E, and the like, but is not limited thereto.

An introducing tube 310 is connected to the flow path port on the upstream side of the two flow path ports (not illustrated) formed in the joining block 30, by a joining member 300. A sealing member (not illustrated) is interposed between the joining member 300 and the joining block 30. Examples of the sealing member include a gasket made of a metal, a resin, or the like.

Examples of the gasket include a soft gasket, a semi-metal gasket, a metal gasket, and the like. Specifically, the gaskets below are preferably used.

(1) Soft Gasket

-   -   Rubber O-ring     -   Rubber sheet (for a flat face)     -   Joint sheet     -   Expanded graphite sheet     -   Polytetrafluoroethylene (PTFE) sheet     -   Polytetrafluoroethylene (PTFE) jacket type         (2) Semi-Metal Gasket     -   Spiral-wound gasket     -   Metal jacket gasket         (3) Metal Gasket     -   Metal flat gasket     -   Metal hollow O-ring     -   Ring joint

The gasket is pressed to provide a seal between the joining member 300 and the joining block 30 by tightening two tightening bolts BT2 from both sides of the gasket (not illustrated) described above. The configuration of the fluid flow path formed in the joining block 30 is the same as that in the joining block 20 described later, and thus a description thereof is omitted here. The flow path port on the downstream side (not illustrated) of the joining block 30 is connected with the switch valve 110A. The connecting structure of this section is the same as the connecting structure described later of the joining block 20 and the fluid devices 110A to 110E described later, and thus a detailed description thereof is omitted.

A process gas such as ammonia gas, a process gas such as hydrogen gas, and a purge gas such as nitrogen gas are respectively introduced to the flow paths of three routes of the fluid control system 1 through the introducing tube 310 on the front side, the introducing tube 310 in the central portion, and the introducing tube 310 on the rear side, for example.

The three switch valves (three-way valves) 110D are connected to one another by a communicating tube 320, and thus the purge gas can be introduced to the flow path of the process gas.

The communicating tube 330 is provided midway on the flow path in place of the mass flow controller 110E since the mass flow controller 110E is not required in the flow path route of the purge gas.

A supply tube 340 connects the three joining members 300 disposed on the downstream side, and is connected to a processing chamber (not illustrated).

Stoppers 400 are fixed to a bottom surface of a guide part 55 by the tightening bolts BT2 in the end portions on the upstream side and the downstream side of the front side, the central portion, and the rear side, and thus movement in the longitudinal directions G1, G2 of the fluid devices 110A to 110E connected to one another by each flow path route is regulated. The fixed positions of the stoppers 400 can be suitably changed and adjusted in accordance with the number of fluid devices and the like.

FIG. 2A to FIG. 2C are diagrams illustrating a partial assembly 200 constituting the flow path of one route of the fluid control system 1, FIG. 2A being a perspective view, FIG. 2B being a side view, and FIG. 2C being a cross-sectional view along line IIC-IIC in FIG. 2B.

The assembly 200 comprises the rail member 50, the upstream side and the downstream side joining blocks 20, 20 disposed on this rail member 50, and the switch valve 110A as a fluid device disposed on the upstream side and the downstream side joining blocks 20, 20. Further, gaskets 120, 120 are provided as sealing members between a body 113 of the switch valve 110A and the upstream side and the downstream side joining blocks 20, 20. Furthermore, the assembly 200 comprises two tightening bolts BT for connecting the body 113 of the switch valve 110A to the upstream side and the downstream side joining blocks 20, 20.

FIG. 3A to FIG. 3D are diagrams illustrating the rail member 50, FIG. 3A being an external perspective view, FIG. 3B being a plan view, FIG. 3C being a front view, and FIG. 3D being a side view.

The rail member 50 is, for example, a long member made of a metal such as a stainless alloy, has a cross section formed into a rectangular shape, and defines a top surface 51, two side surfaces 52 orthogonal thereto, a bottom surface 53 parallel with the top surface 51 and orthogonal to the side surfaces 52, and both end surfaces 54 in the longitudinal direction. The guide part 55 formed into a groove shape in the longitudinal direction extends to the top surface 51. This guide part 55, as illustrated in FIG. 3D, is formed symmetrically with respect to a virtual central plane CP passing through a center position of the top surface 51 and the bottom surface 53 of the rail member 50 and extending in the longitudinal direction, and comprises a bottom surface 55 b and two receiving surfaces 55 f inclined into a fan shape toward the bottom surface 55 b. The two receiving surfaces 55 f are inclined in opposite directions. The receiving surfaces 55 f are inclined at an angle of about 57 degrees with respect to the bottom surface 55 b, but the angle is not limited thereto. The top surface 51 of the rail member 50 functions as a support surface capable of supporting the joining blocks 20, 30 and the stoppers 400. Through holes 56 for tightening bolts for fixing the rail member 50 to the base plate 10 are formed in both end portions of the bottom surface 55 b of the guide part 55 in the longitudinal direction. The dimensions of the rail member 50 are about 10 mm in width and height, and a total length thereof is about 300 mm. The dimensions, however, are not limited thereto. The stoppers 400 can be fixed by the tightening bolts BT2 in any position of the guide part 55 in the longitudinal direction. The fixing structure adopted can be any known structure, and thus a detailed description thereof is omitted.

FIG. 4A to FIG. 4E are diagrams illustrating the joining block 20, FIG. 4A being an external perspective view, FIG. 4B being a plan view, FIG. 4C being a cross-sectional view along the virtual central plane CP2 in FIG. 4B, FIG. 4D being one end view in the longitudinal direction, and FIG. 4E being the other end view in the longitudinal direction.

The joining block 20 is a member made of a metal such as a stainless alloy, and comprises a top surface 20 a and a bottom surface 20 b, which are flat surfaces facing each other, and four side surfaces 21 a, 21 b, 21 c, 21 d, each orthogonal to the top surface 20 a. Among the four side surfaces 21 a, 21 b, 21 c, 21 d, the two side surfaces adjacent to each other are orthogonal to each other. The side surfaces 21 a, 21 b are flat surfaces positioned at both ends in the longitudinal direction, and the side surfaces 21 c, 21 d are flat surfaces extending in the longitudinal direction. It should be noted that, while an example is given in which the joining block 20 has a rectangular parallelepiped shape, another shape may be adopted.

The bottom surface 20 b functions as a supported surface supported by the top surface 51 of the rail member 50. An engaging part 22, however, is integrally formed on this bottom surface 20 b so as to protrude. The engaging part 22 is formed in a fan shape from the bottom surface 20 b downward, and comprises engaging surfaces 22 f inclined in directions opposite each other. The engaging part 22 is formed symmetrically with respect to a virtual central plane CP2, and the inclined angle of the engaging surfaces 22 f with respect to a bottom surface 22 b is substantially the same as that of the receiving surfaces 55 f of the rail member 50, but is not limited thereto. The engaging part 22 has a shape that fits together with the guide part 55 of the rail member 50, and is insertable from both end portions of the rail member 50 in the longitudinal direction. The guide part 55 constrains the joining block 20 on the rail member 50 while allowing the engaging part 22 to move in the longitudinal direction. While play within a set tolerance range exists between the engaging part 22 and the guide part 55 from the perspective of machining and assembly, this play is set within a range in which an alignment mechanism described later reliably operates.

A fluid flow path 23 defined by the joining block 20 includes a first vertical flow path 23 a extending from the top surface 20 a toward the bottom surface 20 b side and provided with a flow path port 24 a that opens at the top surface 20 a; a second vertical flow path 23 b extending from the top surface 20 a toward the bottom surface 20 b side and provided with a flow path port 24 b that opens at the top surface 20 a, in positions separated from each other in a longitudinal direction; and a horizontal flow path 23 c extending linearly through an interior of the joining block 20 in the longitudinal direction and connected with the first and the second vertical flow paths 23 a, 23 b. It should be noted that, while the first and the second vertical flow paths 23 a, 23 b are formed vertically with respect to the top surface 20 a, and the horizontal flow path 23 c is formed in parallel with the top surface 20 a, the arrangement is not limited thereto, and the flow paths may be set as neither vertical nor horizontal.

The first and the second vertical flow paths 23 a, 23 b may be machined by, for example, making a hole with a drill on the top surface 20 a of the joining block 20 in the vertical direction to form a blind hole. The horizontal flow path 23 c may be machined by making a hole with a drill on the side surface 21 a of the joining block 20 in the vertical direction to form a blind hole. At this time, the horizontal flow path 23 c is machined at a height connected with the tip portions of the first and the second vertical flow paths 23 a, 23 b. When the hole for forming the horizontal flow path 23 c is opened from the side surface 21 a of the joining block 20, an opening is formed on the side surface 21 a. Thus, a holding recessed part 28 is formed around the opening of the side surface 21 a, a closing member 150 having a disc shape and made of a metal is fit into this holding recessed part 28, and an outer periphery edge portion of the closing member 150 is sealed by welding, thereby closing the opening. As a result, a U-shaped flow path comprising the first and the second vertical flow paths 23 a, 23 b and the horizontal flow path 23 c is formed.

Holding recessed parts 26, 26 for respectively holding the gaskets 120 are formed around the flow path ports 24 a, 24 b that open on the top surface 20 a side of the joining block 20. A protrusion (not illustrated) having a circular shape and subjected to a hardening treatment to achieve a hardness sufficiently higher than that of the gasket 120 in order to crush the gasket 120 may be formed on the outer periphery of the flow path ports 24 a, 24 b on the bottom surfaces of the holding recessed parts 26, 26.

Two screw holes 25 a, 25 b that open at the top surface 20 a and extend toward the bottom surface 20 b side are formed in the longitudinal direction in the joining block 20. The screw holes 25 a, 25 b are positioned between the two flow path ports 24 a, 24 b that open at the top surface 20 a. The screw holes 25 a, 25 b are, for example, size M5, comprise at least three threads, and have a depth of about 3 mm, but are not limited thereto. Further, while central axes thereof are positioned on the virtual central plane CP2, the positioning is not limited thereto, and the screw holes 25 a, 25 b may be shifted one way in the width direction, or one of the screw holes 25 a, 25 b may be disposed on the side surface 21 c side while the other may be disposed on the side surface 21 d side. Furthermore, the dimensional specifications of the joining block 20 are, for example, a width of about 10 mm, a length of about 30 mm, a diameter of the fluid flow path 23 of about 2.6 mm, and a height of about 13 mm, but are not limited thereto. The widths of the joining block 20 and the rail member 50 are about 10 mm, substantially matching.

The screw hole 25 a is positioned above the horizontal flow path 23 c, and the screw hole 25 a and the horizontal flow path 23 c overlap in the planar view illustrated in FIG. 4B. Furthermore, the screw hole 25 a is on the side surface 21 b side rather than on the side surface 21 a side, with respect to the flow path port 24 a, and is formed only on one side with respect to the flow path port 24 a in the longitudinal direction of the joining block 20. With such a configuration, a cross-sectional area of the fluid flow path 23 can be maintained, the gasket 120 that seals the periphery of the flow path port 24 a can be crushed by the tightening force of the one tightening bolt BT, and the joining block 20 and the body 113 of the switch valve 110A can be connected. As a result, the width of the joining block 20 can be greatly narrowed. Similarly, the screw hole 25 b is positioned above the horizontal flow path 23 c, and the screw hole 25 b and the horizontal flow path 23 c overlap in the planar view illustrated in FIG. 4B. Furthermore, the screw hole 25 b is on the side surface 21 a side rather than on the side surface 21 b side, with respect to the flow path port 24 b, and is formed only on one side with respect to the flow path port 24 b. With such a configuration, the cross-sectional area of the fluid flow path 23 can be maintained, the gasket 120 that seals the periphery of the flow path port 24 b can be crushed by the one tightening bolt BT, and the joining block 20 and the body 113 of another fluid device can be connected.

Furthermore, as is clear from FIG. 4C and FIG. 4E, the horizontal flow path 23 c is biased to the bottom surface 20 b side between the top surface 20 a and the bottom surface 20 b. Adopting such a configuration makes it possible to adequately maintain the depth of the screw holes 25 a, 25 b in which the tightening bolts BT are screwed.

FIG. 5A to FIG. 5C are diagrams illustrating the switch valve (fluid device) 110A, FIG. 5A being a perspective view, FIG. 5B being a bottom view, and FIG. 5C being a partial cross-sectional view in the direction of line VC-VC in FIG. 5B.

The switch valve 110A comprises an actuator incorporating part 111, a valve incorporating part 112, and the body 113, and is supported by the rail member 50 via the joining block 20.

The width of the body 113 matches the width of the joining block 20, and is, for example, about 10 mm. However, the width is not limited thereto.

The body 113 defines a fluid flow path 117. This fluid flow path 117 comprises two flow path ports 117 a that open on a bottom surface 113 b side, and holding recessed parts 116 for respectively holding the gaskets 120 are formed in the two flow path port 117 a. A protrusion (not illustrated) having a circular shape and subjected to a hardening treatment to achieve a hardness sufficiently higher than that of the gasket 120 in order to crush the gasket 120 may be formed in the holding recessed part 116.

Through holes 114 for inserting the tightening bolts BT therethrough may be formed from a top surface 113 a toward the bottom surface 113 b in both end portions of the body 113 in the longitudinal direction.

FIG. 6A to FIG. 6C are a perspective view, a plan view, and a cross-sectional view of the gasket 120.

The gasket can be formed using the same material as that of the body 113 made of a stainless alloy or the like, but needs to be thermally treated so that the hardness is sufficiently lower than that of the body 113. Other than a metal material, a gasket made of a resin may also be used.

FIG. 7A and FIG. 7B are a perspective view of the tightening bolt BT and a plan view of the head portion. The tightening bolt BT connects the body 113 and the joining block 20, and has a diameter (M5, for example) greater than that (M4, for example) of the tightening bolt BT2 used in other locations in order to singly bear the force for crushing the gasket 120, but all tightening bolts may be a common size.

Here, the role of the rail member 50 and the alignment mechanism of the present invention will be described.

In the embodiment described above, the alignment mechanism includes the two receiving surfaces 55 f of the guide part 55 of the rail member 50, and two engaging surfaces 22 f of the engaging part 22 of the joining block 20.

FIG. 8A illustrates the two joining blocks 20, 20 placed on a reference surface BS rather than on the rail member 50, the gaskets 120 disposed in predetermined locations, and the body 113 of the switch valve 110A as the fluid device placed thereon.

In this state, the gaskets 120 are not pressed, and thus a substantially uniform gap GP is formed between the bottom surface 113 b of the body 113 and the top surface 20 a of the two joining blocks 20.

Next, as illustrated in FIG. 8B, when the tightening bolts BT are inserted through the through holes 114 of the body 113, screwed into the screw holes 25 a, 25 a of the upstream side and the downstream side joining blocks 20, 20, and tightened, a lifting force in the direction indicated by arrows F1A, F2A in the screw holes 25 a, 25 a and a downward force indicated by arrows F1B, F2B from the gaskets 120, 120 act on the upstream side and the downstream side joining blocks 20, 20. Accordingly, an upstream side end portion of the upstream side joining block 20 rises in a direction D1 relative to the reference surface BS, and a downstream side end portion of the downstream side joining block 20 also rises in a direction D2 relative to the reference surface BS.

The gaskets are pressed by the tightening force of the tightening bolts BT, and thus a gap GP2 of a position separated from the gasket 120, while smaller than the gap GP in FIG. 8A, is smaller than a gap GP1 in the vicinity of the gasket 120. Thus, a bending force that causes the upstream side joining block 20 and the downstream side joining block 20 to incline in opposite directions acts on the body 113 and the upstream side and the downstream side joining blocks 20, 20 connected to each other.

As illustrated in FIG. 8C, when the engaging parts 22, 22 of the upstream side and the downstream side joining blocks 20, 20 are inserted into the guide part 55 of the rail member 50, and the tightening bolts BT are tightened in the same manner as in FIG. 8B, the upstream side and the downstream side joining blocks 20, 20 receive a reaction force in the downward direction indicated by arrows F1C, F2C from the receiving surfaces 55 f of the guide part 55 of the rail member 50 resisting the bending force described above, and thus the upstream side and the downstream side joining blocks 20, 20 never incline. As the tightening bolts BT are tightened so as to reach a required axial force, a gap GP3 between the bottom surface 113 b of the body 113 and the top surfaces 20 a of the two joining blocks 20 becomes zero or substantially zero, and the bottom surface 113 b of the body 113 and the top surfaces 20 a of the two joining blocks 20 are brought substantially in contact.

Here, as described above, when slight play exists between the guide part 55 of the rail member 50 and the engaging parts 22, 22 of the upstream side and the downstream side joining blocks 20, 20 with the tightening bolts BT not tightened, the virtual central plane CP2 of the engaging part 22 may be displaced in a leftward direction L with respect to the virtual central plane CP of the guide part 55 of the rail member 50 as illustrated in FIG. 9A or in a rightward direction R as illustrated in FIG. 9B, for example.

For example, when displacement exists in a horizontal direction (direction orthogonal to the longitudinal direction), as illustrated in FIG. 9A and FIG. 9B, the plurality of fluid devices 110A to 110E may meander on the rail member 50 or incline to the left or right side, possibly resulting in a deterioration in sealing performance of the gasket 120.

In this embodiment, the alignment mechanism is provided between the guide part 55 and the engaging part 22 as described above. The alignment mechanism utilizes a portion of the reaction force that resists the bending force produced by the tightening force of the tightening bolts BT on the body 113 and the upstream side and the downstream side joining blocks 20, 20 connected to each other, and acts so as to align the positions of the upstream side and the downstream side joining blocks 20, 20 in the horizontal direction orthogonal to the longitudinal direction of the guide part 55 to a center position of the guide part 55. As a result, the horizontal displacement described above is automatically corrected (automatically moved from an initial position to a regular position) during assembly.

Specifically, as illustrated in FIG. 10, when a lifting force F acts on the joining block 20 due to a bending force, the two receiving surfaces 55 f of the guide part 55 apply reaction forces R1, R2 to the two engaging surfaces 22 f of the engaging part 22. The guide part 55 and the engaging part 22 are symmetrically formed with respect to the virtual central planes CP, CP2, and thus the reaction forces R1, R2 become the same size. Then, horizontal component forces Rlx, R2 x of the reaction forces R1, R2 are the same size in directions opposite each other, and thus act so as to cause the virtual central plane CP2 of the engaging part 22 to match the virtual central plane CP of the guide part 55.

Further, vertical component forces R1 y, R2 y of the reaction forces R1, R2 are the same size and resist the lifting force F, acting so as to constrain the joining block 20 on the rail member 50 (so as to make the rail member function as a support member and support the joining block 20 at the regular position in a fixed manner).

Thus, according to this embodiment, as long as the joining block 20 is inserted into the guide part 55 of the rail member 50 and the body 113 of the fluid device and the joining block 20 are connected by the tightening bolt BT, the joining block 20 is automatically aligned in the center position of the guide part 55, making the assembly work significantly easier and assembly automation easier as well.

While the engaging surfaces 22 f of the engaging part 22 and the receiving surfaces 55 f of the guide part 55 are formed by inclined surfaces only in the embodiment described above, an engaging part 22_1 and a guide part 55_1 may be configured by an inclined surface and a vertical surface, as illustrated in FIG. 11A. Further, as illustrated in FIG. 11B and FIG. 11C, a curved surface may be used in engaging parts 22_2, 22_3 and guide parts 55_2, 55_3. Furthermore, as illustrated in FIGS. 12A, 12B, engaging parts 22_4, 22_5 may have recessed shapes, and guide parts 55_4, 55_5 may have protruding shapes.

While a case where the joining block 20 and the body 113 are connected by one tightening bolt BT has been described in the embodiment described above, as long as a screw hole exists on the horizontal flow path 23 c side with respect to the flow path port 24 a, a plurality of tightening bolts BT may be used.

Although not used in the embodiment described above, a positioning pin may also be used between the joining block 20 and the body 113.

While the horizontal flow path 23 c is biased to the bottom surface 20 b side of the joining block 20 in the embodiment described above, the positioning is not limited thereto and may be formed in the central portion.

While the rail member 50 on which one guide part 55 is formed as the support member is used in the embodiment described above, the support member is not limited thereto, and a plurality of the guide parts 55 may be formed on a single plate as the support member. In this case, the configuration may be one in which the base plate 10 is not used.

While the two flow path ports 24 a, 24 b are formed in the joining block 20 and the two screw holes 25 a, 25 b are formed between these in the embodiment described above, the present invention is not limited thereto. The present invention may be applied even when there are three flow path ports, and may be applied even when one flow path port 24 a opens to the top surface 20 a of the joining block 20 and the other flow path port opens to the side surface 21 b of the joining block 20.

While an example has been given of a vertical flow path and a horizontal flow path as the first flow path and the second flow path of the present invention in the embodiment described above, the first and the second flow paths are not limited thereto, and may be inclined with respect to the vertical direction or the horizontal direction.

DESCRIPTIONS OF REFERENCE NUMERALS

-   1 Fluid control system -   10 Base plate -   20A to 20E Joining block -   20 a Top surface -   20 b Bottom surface -   21 a to 21 d Side surface -   22 Engaging part -   22 b Bottom surface -   22 f Engaging surface (Alignment mechanism) -   23 Fluid flow path -   23 a, 23 b Vertical flow path -   23 c Horizontal flow path -   24 a, 24 b Flow path port -   25 a, 25 b Screw hole -   26 Holding recessed part -   30 Joining block -   50 Rail member -   55 Guide part -   55 f Receiving surface (Alignment mechanism) -   110A Switch valve (Two-way valve) (Fluid device) -   110B Regulator (Fluid device) -   110C Pressure gauge (Fluid device) -   110D Switch valve (Three-way valve) (Fluid device) -   110E Mass flow controller (Fluid device) -   111 Actuator incorporating part -   112 Valve incorporating part -   113 Body -   113 a Top surface -   113 b Bottom surface -   114 Through hole -   300 Joining member -   310 Introducing tube -   320 Communicating tube -   330 Communicating tube -   340 Supply tube -   400 Stopper -   BT Tightening bolt -   BT2 Tightening bolt -   GP, GP1, GP2, GP3 Gap 

What is claimed is:
 1. A fluid control system comprising: an upstream side joining block and a downstream side joining block, each comprising a top surface and a bottom surface facing each other, side surfaces extending from the top surface toward the bottom surface side, and an engaging part on the bottom surface side, and defining a fluid flow path and a flow path port of the fluid flow path that opens at the top surface; a support member comprising a guide part extending linearly in a longitudinal direction and engageable with the engaging parts of the upstream side and the downstream side joining blocks; and a fluid device supported by the support member via the upstream side and the downstream side joining block, wherein: the guide part constrains the upstream side and the downstream side joining blocks on the support member while allowing the upstream side and the downstream side joining blocks to move in a guide direction; the fluid device comprises a body defining a fluid flow path and provided with two flow path ports that open at a bottom surface thereof; the upstream side and the downstream side joining blocks each comprise a screw hole formed from the top surface toward the bottom surface side for screwing a tightening bolt that presses a sealing member disposed around the flow path port of the joining block and one of the two flow path ports of the body, that face each other, and connects the body to the joining block; the screw hole of the upstream side joining block is formed only on the upstream side of the flow path port of the upstream side joining block in the longitudinal direction; the screw hole of the downstream side joining block is formed only on the downstream side of the flow path port of the downstream side joining block in the longitudinal direction; and the fluid control system further comprises an alignment mechanism formed between the guide part and the engaging part, that utilizes a portion of a reaction force resisting a bending force produced by a tightening force of the tightening bolt on the body and the upstream side and the downstream side joining blocks connected to the body, and acts so as to align the positions of the upstream side and the downstream side joining blocks in a horizontal direction orthogonal to the longitudinal direction of the guide part to a center position of the guide part.
 2. The fluid control system according to claim 1, wherein the engaging part is formed symmetrically with respect to a virtual central plane orthogonal to the top surface and extending in the longitudinal direction; the guide part is formed symmetrically with respect to a virtual central plane orthogonal to a top surface of the support member and extending in the longitudinal direction; and the engaging part and the guide part comprises inclined surfaces or curved surfaces symmetrical with respect to the virtual central plane extending in the longitudinal direction.
 3. The fluid control system according to claim 1, wherein the upstream side and the downstream side joining blocks are each connected to the body of the fluid device by a single tightening bolt.
 4. A semiconductor manufacturing method that uses the fluid control system described in claim 1 for controlling a fluid used in a semiconductor manufacturing process.
 5. A flat panel display manufacturing method that uses the fluid control system described in claim 1 for controlling a fluid used in a flat panel display manufacturing process.
 6. A solar panel manufacturing method that uses the fluid control system described in claim 1 for controlling a fluid used in a solar panel manufacturing process. 